Name the biological catalysts which bring about chemical digestion of food.

What is the name of the opening in the human body through which undigested food is thrown out?

Where is digested food absorbed into blood in human body?

Fill in the following blanks with suitable words:

(a) All green plants are...........

(b) All non-green plants and animals are ..............

(c) Heterotrophs depend on ............. and other ................... for food.

(d) Green plants use ............ and ............... to make food.

(e) Iodine turns blue-black on reacting with ........................

What is chlorophyll ? What part does chlorophyll play in photosynthesis?